jaroslav@601: /*
jaroslav@601:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@601:  *
jaroslav@601:  * This code is free software; you can redistribute it and/or modify it
jaroslav@601:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@601:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@601:  * particular file as subject to the "Classpath" exception as provided
jaroslav@601:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@601:  *
jaroslav@601:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@601:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@601:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@601:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@601:  * accompanied this code).
jaroslav@601:  *
jaroslav@601:  * You should have received a copy of the GNU General Public License version
jaroslav@601:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@601:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@601:  *
jaroslav@601:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@601:  * or visit www.oracle.com if you need additional information or have any
jaroslav@601:  * questions.
jaroslav@601:  */
jaroslav@601: 
jaroslav@601: /*
jaroslav@601:  * This file is available under and governed by the GNU General Public
jaroslav@601:  * License version 2 only, as published by the Free Software Foundation.
jaroslav@601:  * However, the following notice accompanied the original version of this
jaroslav@601:  * file:
jaroslav@601:  *
jaroslav@601:  * Written by Doug Lea with assistance from members of JCP JSR-166
jaroslav@601:  * Expert Group and released to the public domain, as explained at
jaroslav@601:  * http://creativecommons.org/publicdomain/zero/1.0/
jaroslav@601:  */
jaroslav@601: 
jaroslav@601: package java.util.concurrent;
jaroslav@601: 
jaroslav@601: /**
jaroslav@601:  * A task that returns a result and may throw an exception.
jaroslav@601:  * Implementors define a single method with no arguments called
jaroslav@601:  * <tt>call</tt>.
jaroslav@601:  *
jaroslav@601:  * <p>The <tt>Callable</tt> interface is similar to {@link
jaroslav@601:  * java.lang.Runnable}, in that both are designed for classes whose
jaroslav@601:  * instances are potentially executed by another thread.  A
jaroslav@601:  * <tt>Runnable</tt>, however, does not return a result and cannot
jaroslav@601:  * throw a checked exception.
jaroslav@601:  *
jaroslav@601:  * <p> The {@link Executors} class contains utility methods to
jaroslav@601:  * convert from other common forms to <tt>Callable</tt> classes.
jaroslav@601:  *
jaroslav@601:  * @see Executor
jaroslav@601:  * @since 1.5
jaroslav@601:  * @author Doug Lea
jaroslav@601:  * @param <V> the result type of method <tt>call</tt>
jaroslav@601:  */
jaroslav@601: public interface Callable<V> {
jaroslav@601:     /**
jaroslav@601:      * Computes a result, or throws an exception if unable to do so.
jaroslav@601:      *
jaroslav@601:      * @return computed result
jaroslav@601:      * @throws Exception if unable to compute a result
jaroslav@601:      */
jaroslav@601:     V call() throws Exception;
jaroslav@601: }